Bluetooth: ISO: Rework sync_interval to be sync_factor

This rework sync_interval to be sync_factor as having sync_interval in
the order of seconds is sometimes not disarable.

Wit sync_factor the application can tell how many SDU intervals it wants
to send an announcement with PA, the EA interval is set to 2 times that
so a factor of 24 of BIG SDU interval of 10ms would look like the
following:

< HCI Command: LE Set Extended Advertising Parameters (0x08|0x0036) plen 25
        Handle: 0x01
        Properties: 0x0000
        Min advertising interval: 480.000 msec (0x0300)
        Max advertising interval: 480.000 msec (0x0300)
        Channel map: 37, 38, 39 (0x07)
        Own address type: Random (0x01)
        Peer address type: Public (0x00)
        Peer address: 00:00:00:00:00:00 (OUI 00-00-00)
        Filter policy: Allow Scan Request from Any, Allow Connect Request from Any (0x00)
        TX power: Host has no preference (0x7f)
        Primary PHY: LE 1M (0x01)
        Secondary max skip: 0x00
        Secondary PHY: LE 2M (0x02)
        SID: 0x00
        Scan request notifications: Disabled (0x00)
< HCI Command: LE Set Periodic Advertising Parameters (0x08|0x003e) plen 7
        Handle: 1
        Min interval: 240.00 msec (0x00c0)
        Max interval: 240.00 msec (0x00c0)
        Properties: 0x0000
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/bluetooth/bluetooth.h

@@ -185,7 +185,7 @@ struct bt_iso_ucast_qos {
 struct bt_iso_bcast_qos {
 	__u8  big;
 	__u8  bis;
-	__u8  sync_interval;
+	__u8  sync_factor;
 	__u8  packing;
 	__u8  framing;
 	struct bt_iso_io_qos in;

net/bluetooth/hci_conn.c

@@ -2075,10 +2075,10 @@ static int create_big_sync(struct hci_dev *hdev, void *data)
 		flags |= MGMT_ADV_FLAG_SEC_2M;
 
 	/* Align intervals */
-	interval = qos->bcast.out.interval / 1250;
+	interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
 
 	if (qos->bcast.bis)
-		sync_interval = qos->bcast.sync_interval * 1600;
+		sync_interval = interval * 4;
 
 	err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len,
 				     conn->le_per_adv_data, flags, interval,

net/bluetooth/iso.c

@@ -704,7 +704,7 @@ static struct bt_iso_qos default_qos = {
 	.bcast = {
 		.big			= BT_ISO_QOS_BIG_UNSET,
 		.bis			= BT_ISO_QOS_BIS_UNSET,
-		.sync_interval		= 0x00,
+		.sync_factor		= 0x01,
 		.packing		= 0x00,
 		.framing		= 0x00,
 		.in			= DEFAULT_IO_QOS,
@@ -1213,7 +1213,7 @@ static bool check_ucast_qos(struct bt_iso_qos *qos)
 
 static bool check_bcast_qos(struct bt_iso_qos *qos)
 {
-	if (qos->bcast.sync_interval > 0x07)
+	if (qos->bcast.sync_factor == 0x00)
 		return false;
 
 	if (qos->bcast.packing > 0x01)